The coherent combination of one-dimensional fiber laser array is studied experimentally by self-imaging confocal resonator. The phase locking output of Yb doped double-cladding fiber laser array was obtained, and the intensity distribution of the far field pattern based on one-dimensional fiber laser array by self-imaging confocal resonator was also realized. Based on the theoretical calculations of the self-imaging confocal resonator, a proper width metal wire is chosen as the spatial filter and steady interference fringes are experimentally obtained when the filter is placed at the plane of output mirror. The experiment results verify the loss functions of the spatial filter for different mode patterns with different filter place and confirm the spatial filter’s mechanism of mode selection.